如何使用Java验证证书是否为EV证书？

考虑以下示例代码，它使用一个

TrustManager

来记录传出连接是否使用了有效的证书（但在所有情况下都接受该连接）：

在

checkClientTrusted

方法中，我需要做什么来检查该证书是扩展验证证书（现代浏览器中的绿色地址栏）还是普通证书（黄色地址栏）

编辑：

我试图让一个

CertPathValidator

工作，但不知何故，我只得到关于证书不是CA证书的异常。。。有什么想法吗

edit2:使用

PKIXParameters

而不是

PKIXBuilderParameters

private boolean isEVCertificate(X509Certificate[] certs, String authType) {
    try {
        CertPath cp = new X509CertPath(Arrays.asList(certs));
        KeyStore ks = KeyStore.getInstance("JKS");
        ks.load(new FileInputStream(new File(System.getProperty("java.home"), "lib/security/cacerts")), null);
        PKIXParameters cpp = new PKIXParameters(ks);
        cpp.setRevocationEnabled(false);
        CertPathValidator cpv = CertPathValidator.getInstance("PKIX");          
        PKIXCertPathValidatorResult res = (PKIXCertPathValidatorResult) cpv.validate(cp, cpp);
        System.out.println(res.getTrustAnchor().getCAName());
        System.out.println(res.getPolicyTree().getValidPolicy());
        System.out.println(cp);
        return false;
    } catch (Exception ex) {
        ex.printStackTrace();
        return false;
    }
}

我正在测试真实世界的电动汽车证书。该代码现在适用于

www.paypal.com

（从某种意义上说，它不会引发异常），但不适用于

banking.dkb.de

：-(

---

但是，即使使用Paypal.com，信任锚getCAName也会返回null，因此我如何知道它是根据哪个CA验证的，以便查找正确的EV策略？

首先，您需要一个发卡机构名称及其相应的EV策略标识符的表

CA颁发证书时，他们可以记录颁发证书所依据的策略。此策略的标识符由颁发者分配，因此您需要颁发者及其EV策略的列表

然后，您将需要从服务器证书获取策略。了解有关策略的一般信息及其工作方式的更多信息

您需要验证证书链以获得

PKIxCertPathValidator结果。

结果的一部分是策略树，您可以在策略树中导航以确定它是否包含目标证书颁发者的EV策略

---

下面是检查证书路径结果的详细示例

private static final Map<X500Principal, String> policies = new HashMap<X500Principal, String>();

static {
  /* 
   * It would make sense to populate this map from Properties loaded through 
   * Class.getResourceAsStream().
   */
  policies.put(
    new X500Principal("OU=Class 3 Public Primary Certification Authority,O=VeriSign\\, Inc.,C=US"), 
    "2.16.840.1.113733.1.7.23.6"
  );
  // ...
}

static boolean isEV(PKIXCertPathValidatorResult result)
{
  /* Determine the policy to look for. */
  X500Principal root = result.getTrustAnchor().getTrustedCert().getSubjectX500Principal();
  String policy = policies.get(root);
  if (policy == null)
    /* The EV policy for this issuer is unknown (or there is none). */
    return false;
  /* Traverse the tree, looking at its "leaves" to see if the end-entity 
   * certificate was issued under the corresponding EV policy. */
  PolicyNode tree = result.getPolicyTree();
  Deque<PolicyNode> stack = new ArrayDeque<PolicyNode>();
  stack.push(tree);
  while (!stack.isEmpty()) {
    PolicyNode current = stack.pop();
    Iterator<? extends PolicyNode> children = current.getChildren();
    int leaf = stack.size();
    while (children.hasNext())
      stack.push(children.next());
    if (stack.size() == leaf) {
      /* If the stack didn't grow, there were no "children". I.e., the 
       * current node is a "leaf" node of the policy tree. */
      if (current.getValidPolicy().equals(policy))
        return true;
    }
  }
  /* The certificate wasn't issued under the authority's EV policy. */
  return false;
}

private static final Map policies=new HashMap（）；
静止的{
/* 
*从通过加载的属性填充此映射是有意义的
*Class.getResourceAsStream（）。
*/
政策，付诸表决(
新X500主体（“OU=3级公共初级认证机构，O=VeriSign\\，Inc.，C=US”），
"2.16.840.1.113733.1.7.23.6"
);
// ...
}
静态布尔isEV（PKIXCertPathValidatorResult）
{
/*确定要查找的策略*/
X500Principal root=result.getTrustedAnchor（）.getTrustedCert（）.getSubjectX500Principal（）；
字符串policy=policies.get（root）；
如果（策略==null）
/*该发行人的电动汽车政策未知（或没有）*/
返回false；
/*遍历树，查看其“叶子”，以查看结束实体
*证书是根据相应的电动汽车政策颁发的*/
PolicyNode tree=result.getPolicyTree（）；
Deque stack=new ArrayDeque（）；
栈。推（树）；
而（！stack.isEmpty（））{
PolicyNode current=stack.pop（）；
迭代器EDIT：发布附加代码

如果您使用Sun的X509实现，您可以这样做

  CertificatePoliciesExtension ext = ((X509CertImpl)cert).getCertificatePoliciesExtension();
  List<PolicyInformation> policies = (List<PolicyInformation>)ext.get(CertificatePoliciesExtension.POLICIES);
  boolean evCert = false;
  for (PolicyInformation info : policies) {
      CertificatePolicyId id = info.getPolicyIdentifier();
      if (isEVPolicy(id)) {
         evCert = true;
         break;                 
      }             
  }

  ......

  public static ObjectIdentifier[] EV_POLICIES;

  static {
      try {
          EV_POLICIES = new ObjectIdentifier[] {
                new ObjectIdentifier("2.16.840.1.113733.1.7.23.6"), // Verisign
                new ObjectIdentifier("1.3.6.1.4.1.14370.1.6"), // Geo-Trust of Verisign
                new ObjectIdentifier("2.16.840.1.113733.1.7.48.1") // Thawte
          };
      } catch (IOException e) {
        throw new IllegalStateException("Invalid OIDs");
      }
  }

  private boolean isEVPolicy(CertificatePolicyId id) {
    for (ObjectIdentifier oid : EV_POLICIES) {
        if (oid.equals((Object)id.getIdentifier())) 
            return true;
    }
    return false;
 }

CertificatePolicyExtension ext=（（X509CertImpl）cert）.getCertificatePolicyExtension（）；
列表策略=（列表）ext.get（CertificatePolicyExtension.Policys）；
布尔evCert=false；
对于（策略信息：策略）{
CertificatePolicyId=info.getPolicyIdentifier（）；
如果（ISEVpolicity（id））{
evCert=真；
打破
}             
}
......
公共静态对象标识符[]EV_策略；
静止的{
试一试{
EV_策略=新对象标识符[]{
新的ObjectIdentifier（“2.16.840.1.113733.1.7.23.6”），//Verisign
新的ObjectIdentifier（“1.3.6.1.4.1.14370.1.6”），//Verisign地理信托
新的目标标识符（“2.16.840.1.113733.1.7.48.1”）//Thawte
};
}捕获（IOE异常）{
抛出新的非法状态异常（“无效OID”）；
}
}
私有布尔isEVPolicy（CertificatePolicyId）{
用于（ObjectIdentifier oid:EV_策略）{
if（oid.equals（（对象）id.getIdentifier（））
返回true；
}
返回false；
}

我们只允许来自3个CA的EV证书。您可以在该阵列中添加更多EV OID。您可以从中获得OID的完整列表

我终于让它工作了……下面是一个运行的最小示例，显示了所有逻辑和检查。是的，它适用于
banking.dkb.de
：-）

感谢所有帮助我的人。欢迎对明显的安全漏洞或其他任何东西（除了代码样式或缺少错误处理；我努力将代码压缩到可运行代码的绝对最小值）发表任何评论，因此请随时发表评论：）

import java.io.*；
导入java.security.*；
导入java.security.cert.*；
导入java.util.*；
导入javax.net.ssl.*；
导入javax.security.auth.x500.x500主体；
公共类CertChecker实现X509TrustManager{
私人最终X509TrustManager defaultTM；
public CertChecker（）引发GeneralSecurityException{
TrustManagerFactory tmf=TrustManagerFactory.getInstance（TrustManagerFactory.getDefaultAlgorithm（））；
init（（密钥库）null）；
defaultTM=（X509TrustManager）tmf.getTrustManager（）[0]；
}
public void checkServerTrusted（X509Certificate[]证书，字符串authType）{
如果（defaultTM！=null）{
试一试{
defaultTM.checkServerTrusted（证书、authType）；
if（isEVCertificate（certs））
System.out.println（“EV证书：+certs[0].getSubjectX500Principal（）.getName（）+”由“+certs[0].getIssuerX500Principal（）.getName（）颁发）；
System.out.println（“有效证书”）；
}捕获（证书例外）{
System.out.println（“证书无效：+ex.getMessage（））；
}
}
}
专用布尔isEVCertificate（X509Certificate[]证书）{
试一试{
  CertificatePoliciesExtension ext = ((X509CertImpl)cert).getCertificatePoliciesExtension();
  List<PolicyInformation> policies = (List<PolicyInformation>)ext.get(CertificatePoliciesExtension.POLICIES);
  boolean evCert = false;
  for (PolicyInformation info : policies) {
      CertificatePolicyId id = info.getPolicyIdentifier();
      if (isEVPolicy(id)) {
         evCert = true;
         break;                 
      }             
  }

  ......

  public static ObjectIdentifier[] EV_POLICIES;

  static {
      try {
          EV_POLICIES = new ObjectIdentifier[] {
                new ObjectIdentifier("2.16.840.1.113733.1.7.23.6"), // Verisign
                new ObjectIdentifier("1.3.6.1.4.1.14370.1.6"), // Geo-Trust of Verisign
                new ObjectIdentifier("2.16.840.1.113733.1.7.48.1") // Thawte
          };
      } catch (IOException e) {
        throw new IllegalStateException("Invalid OIDs");
      }
  }

  private boolean isEVPolicy(CertificatePolicyId id) {
    for (ObjectIdentifier oid : EV_POLICIES) {
        if (oid.equals((Object)id.getIdentifier())) 
            return true;
    }
    return false;
 }

import java.io.*;
import java.security.*;
import java.security.cert.*;
import java.util.*;

import javax.net.ssl.*;
import javax.security.auth.x500.X500Principal;

public class CertChecker implements X509TrustManager {

    private final X509TrustManager defaultTM;

    public CertChecker() throws GeneralSecurityException {
        TrustManagerFactory tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
        tmf.init((KeyStore)null);
        defaultTM = (X509TrustManager) tmf.getTrustManagers()[0];
    }

    public void checkServerTrusted(X509Certificate[] certs, String authType) {
        if (defaultTM != null) {
            try {
                defaultTM.checkServerTrusted(certs, authType);
                if (isEVCertificate(certs))
                    System.out.println("EV Certificate: "+ certs[0].getSubjectX500Principal().getName() + " issued by " + certs[0].getIssuerX500Principal().getName());                    
                System.out.println("Certificate valid");
            } catch (CertificateException ex) {
                System.out.println("Certificate invalid: " + ex.getMessage());
            }
        }
    }

    private boolean isEVCertificate(X509Certificate[] certs) {
        try {
            // load keystore with trusted CA certificates
            KeyStore cacerts = KeyStore.getInstance("JKS");
            cacerts.load(new FileInputStream(new File(System.getProperty("java.home"), "lib/security/cacerts")), null);

            // build a cert selector that selects the first certificate of the certificate chain
            // TODO we should verify this against the hostname...
            X509CertSelector targetConstraints = new X509CertSelector();
            targetConstraints.setSubject(certs[0].getSubjectX500Principal());

            // build a cert path from our selected cert to a CA cert
            PKIXBuilderParameters params = new PKIXBuilderParameters(cacerts, targetConstraints);        
            params.addCertStore(CertStore.getInstance("Collection", new CollectionCertStoreParameters(Arrays.asList(certs))));
            params.setRevocationEnabled(false);
            CertPath cp = CertPathBuilder.getInstance("PKIX").build(params).getCertPath();

            // validate the cert path
            PKIXCertPathValidatorResult result = (PKIXCertPathValidatorResult) CertPathValidator.getInstance("PKIX").validate(cp, params);
            return isEV(result);
        } catch (Exception ex) {
            ex.printStackTrace();
            return false;
        }
    }

    public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {}
    public X509Certificate[] getAcceptedIssuers() { return null;}

    public static void main(String[] args) throws Exception {
        SSLContext sc = SSLContext.getInstance("SSL");
        sc.init(null, new TrustManager[] {new CertChecker()}, new SecureRandom());
        SSLSocketFactory ssf = (SSLSocketFactory) sc.getSocketFactory();
        ((SSLSocket)ssf.createSocket(args[0], 443)).startHandshake();
    }

    private static final Map<X500Principal, String> policies = new HashMap<X500Principal, String>();

    static {
        // It would make sense to populate this map from Properties loaded through 
        // Class.getResourceAsStream().
        policies.put(
                new X500Principal("OU=Class 3 Public Primary Certification Authority,O=VeriSign\\, Inc.,C=US"), 
                "2.16.840.1.113733.1.7.23.6"
        );
        // TODO add more certificates here
    }

    // based on http://stackoverflow.com/questions/1694466/1694720#1694720
    static boolean isEV(PKIXCertPathValidatorResult result)
    {
        // Determine the policy to look for.
        X500Principal root = result.getTrustAnchor().getTrustedCert().getSubjectX500Principal();
        System.out.println("[Debug] Found root DN: "+root.getName());
        String policy = policies.get(root);
        if (policy != null)
            System.out.println("[Debug] EV Policy should be: "+policy);

        // Traverse the tree, looking at its "leaves" to see if the end-entity 
        // certificate was issued under the corresponding EV policy.
        PolicyNode tree = result.getPolicyTree();
        if (tree == null)
            return false;
        Deque<PolicyNode> stack = new ArrayDeque<PolicyNode>();
        stack.push(tree);
        while (!stack.isEmpty()) {
            PolicyNode current = stack.pop();
            Iterator<? extends PolicyNode> children = current.getChildren();
            int leaf = stack.size();
            while (children.hasNext())
                stack.push(children.next());
            if (stack.size() == leaf) {
                System.out.println("[Debug] Found policy: " + current.getValidPolicy());
                // If the stack didn't grow, there were no "children". I.e., the 
                // current node is a "leaf" node of the policy tree.
                if (current.getValidPolicy().equals(policy))
                    return true;
            }
        }
        // The certificate wasn't issued under the authority's EV policy.
        return false;
    }
}